Amplifying electrical impulses.



R. A. FESSENDEN.

AMPLIFYING ELECTRICAL IMPULSES. APPLICATION FILED MAR. II. IeII.

Patented Sept. 28, 1915.

IMT.' @Ram il me Vtlic electrostatic cagiae,'

frequencies as claimed in United States Letters Patent No. 1,050,441 issued January lei, 1913 upon my application anti that such amplification is protiuceci quite indepentiently of any relation between tile frequency of 'the impulses in the prime iii-cuit and i frequency to which the aniplilyin j circuit istunefl. 'll here is in fact ne necessary lation between these two lrerpiencies,` any resonance that may elicit is l cidental. if', however, a; alicve stated, impulses to lie anipiifiefi irail a. freu" i in the' neighborlioc of' tiie frequency ci? l alternating current which cnergizes tlie a plifying circuit, there will of course lic pro duced in the latter circuit a certain resonant effect, and it the impulses to lie amplified, are of substantial amplituile, tiri: nance nf-` ect will be immaterialn My invention', lio'wev r, is intci'ided chiefly to be einplayctl in those situations where, the a ,iti the impulses 'in the 'prime ciri nnte that the amplification. tue.' highly resonant circuit would lie i' even assumingr that such iinpuliof sustained alternating currents ci frequency.

, `While I'liave siiolien ony i iliarticularly adapted tothe enum,y f

:able signals, and wir ly high speed cable signals* practally uegligibl;l a tcctable, may be nja g' readable, nevertheless i that my invention ciI incre le iaticn, and therefore lawine; 'h scrilicil two ili'ustratiif'e anni inn 'i invention `a 'cel l particular saine, Without, however, limiting tion thereto,

lV hat 'I claim and desire secure by 'Let-- ters Patent ie-G l. The combination ufitii je prime JiicurJ carrying feeble electric impulse@ ciT piiifying circuitcarrying alturnatin and containing an inciuctaucc ai :ciel amplifying circuit bciiir; u( frei.uencyV if Said alternati incuria iiuluctirely 'i .ilie combinar, J. carryn feeble electric piiiiyin l; circuit carryin i and containing an inductanc nicer/isc said amplifying circuit beingr tuned to the frequency ol". salti alternating current, fixed means i'nductively associating said circuits, an indicating device and a rectifier in said an'iplifying circuit.

il, 'iflie combination Ywith a prime circuit rrying feeble electric impulses to be am' ifierl, cl an amplifying circuit carrying aliting current unil containing,r an induc- 'ce and capacity, saii'l ainplifving circuit "l to the frequency of said alter current, and fixed means inl'iuctivcly a ang said circuits, said means conv r a split circuit having oppositely ar' ngciiii rectifierz-i in its resjpective branches.

The. combination with a prime circuit carrfing ier-.ble electrical impulses to be arnof au amplifying circuit carrying alt ri iting current and containing an inductance and capacity, saifl amplifyin circuit .li ig tuned to the frequency of said alten L tingn current, fixed means inductively nSso- 3 til said circuits, said means comprising lit l' lying oppcsitely arranged icctive branches, and an in ,said amplifying circuit. l cfurminatiiui with a prime circuit fc cle trical impulses to be ani-- Liliying circuit carrying al- .t and containing an iniiucacity,'sai l amplifying circuit 'f'rcuiinrccy oifsaid alter-- ai means inductively us nits, saifl means laimprisharing ippositcly arin. 'its re;` nective launches,

l :ini.}':lii 'yi1ig circuit,

n witi a prime circuit ,y Roelf: the county of titatc ci .llzlassachusetts this K l`. )ljlf ilile electri :ai impulses to be am 

